v2.4.0.8

Related Party Transactions - AmTrust (Details) |  |  |  | 3 Months Ended | 9 Months Ended | 21 Months Ended |  | 0 Months Ended | 1 Months Ended | 2 Months Ended | 9 Months Ended | 15 Months Ended | 21 Months Ended | 55 Months Ended | 3 Months Ended | 9 Months Ended | 21 Months Ended | 30 Months Ended | 3 Months Ended | 9 Months Ended | 24 Months Ended | 45 Months Ended | 69 Months Ended | 37 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 13 Months Ended | 37 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 18 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 30 Months Ended | 3 Months Ended | 9 Months Ended | 75 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 10 Months Ended | 3 Months Ended | 9 Months Ended |  | 2 Months Ended | 18 Months Ended | 2 Months Ended | 18 Months Ended |  | 0 Months Ended |
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Sep. 30, 2013 USD ($) | Dec. 31, 2012 USD ($) | Sep. 30, 2013 Founding Shareholders [Member] AmTrust Financial Services, Inc. [Member] | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] USD ($) | Dec. 31, 2012 AmTrust Financial Services, Inc. [Member] USD ($) | Mar. 07, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] | Feb. 09, 2009 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] USD ($) | Jun. 11, 2008 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] USD ($) | Jul. 31, 2007 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] USD ($) | Mar. 06, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] | Dec. 31, 2011 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] | Mar. 31, 2011 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] | Dec. 31, 2012 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] | Dec. 31, 2012 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust European Hospital Liability Quota Share Agreement [Member] EUR (€) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust European Hospital Liability Quota Share Agreement [Member] EUR (€) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust European Hospital Liability Quota Share Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust European Hospital Liability Quota Share Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust European Hospital Liability Quota Share Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust European Hospital Liability Quota Share Agreement [Member] Commissions Paid [Member] USD ($) | Dec. 31, 2009 AmTrust Financial Services, Inc. [Member] AmTrust Workers' Compensation Reinsurance Agreement [Member] | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Workers' Compensation Reinsurance Agreement [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Workers' Compensation Reinsurance Agreement [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Technology Reinsurance Agreement [Member] | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Technology Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust Technology Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Technology Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust Technology Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Technology Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust Technology Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Technology Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust Technology Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Southern General Agency Program Reinsurance Agreement [Member] | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Southern General Agency Program Reinsurance Agreement [Member] | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Southern General Agency Program Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] Southern General Agency Program Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Southern General Agency Program Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] Southern General Agency Program Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Southern General Agency Program Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] Southern General Agency Program Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Southern General Agency Program Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] Southern General Agency Program Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] Commissions Paid [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] Premiums Earned [Member] USD ($) | Dec. 31, 2012 AmTrust Financial Services, Inc. [Member] Reinsurer Trust Assets Collateral Agreement [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Reinsurance Brokerage Agreements [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] Reinsurance Brokerage Agreements [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Reinsurance Brokerage Agreements [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] Reinsurance Brokerage Agreements [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Reinsurance Brokerage Agreements [Member] | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Reinsurance Brokerage Agreements [Member] Brokerage Expense [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] Reinsurance Brokerage Agreements [Member] Brokerage Expense [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Reinsurance Brokerage Agreements [Member] Brokerage Expense [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] Reinsurance Brokerage Agreements [Member] Brokerage Expense [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Asset Management Agreement [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Asset Management Agreement [Member] Investment Management Fees [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] Asset Management Agreement [Member] Investment Management Fees [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] Asset Management Agreement [Member] Investment Management Fees [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] Asset Management Agreement [Member] Investment Management Fees [Member] USD ($) | Dec. 31, 2012 AmTrust Financial Services, Inc. [Member] Asset Management Agreement [Member] Investment Management Fees [Member] USD ($) | Dec. 31, 2011 AmTrust Financial Services, Inc. [Member] AmTrust Time Sharing Agreement [Member] | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Time Sharing Agreement [Member] Aircraft Expenses [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust Time Sharing Agreement [Member] Aircraft Expenses [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] AmTrust Time Sharing Agreement [Member] Aircraft Expenses [Member] USD ($) | Sep. 30, 2012 AmTrust Financial Services, Inc. [Member] AmTrust Time Sharing Agreement [Member] Aircraft Expenses [Member] USD ($) | Sep. 30, 2013 AmTrust Financial Services, Inc. [Member] National General Holdings Corp. [Member] | Sep. 30, 2013 Michael Karfunkel 2005 Grantor Retained Annuity Trust [Member] National General Holdings Corp. [Member] | Sep. 30, 2013 Michael Karfunkel [Member] National General Holdings Corp. [Member] | Mar. 06, 2013 Minimum [Member] AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] | Sep. 30, 2013 Minimum [Member] AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] | Mar. 06, 2013 Maximum [Member] AmTrust Financial Services, Inc. [Member] AmTrust Quota Share Reinsurance Agreement [Member] | Sep. 30, 2013 Maximum [Member] AmTrust Financial Services, Inc. [Member] AmTrust NA Reinsurance Agreement [Member] | Jun. 04, 2013 Series A Preferred Stock [Member] AmTrust Financial Services, Inc. [Member] National General Holdings Corp. [Member] | Jun. 06, 2013 Common Stock [Member] AmTrust Financial Services, Inc. [Member] National General Holdings Corp. [Member] | Jun. 05, 2013 Common Stock [Member] AmTrust Financial Services, Inc. [Member] National General Holdings Corp. [Member] USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 58.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.40% | 41.40% | 15.80% |  |  |  |  |  |  |
Shares owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,054 | 12,295,430 | 42,958
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 286.22 |
Number of shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,850,000 |
Common shares, par value | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01
Percent of premiums written, net of cost of unaffiliated inuring reinsurance from related party |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unearned premiums | $ 1,089,218,000 | $ 936,497,000 |  |  |  |  |  |  |  |  |  | $ 82,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of losses with respect to current lines of business, excluding those above covered business threshold to related party |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covered business threshold |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premiums and losses related to covered business to cede |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission rate, percent of ceded written premiums |  |  |  |  |  |  |  |  |  |  |  |  |  | 31.00% | 34.375% | 30.00% | 31.00% | 31.00% | 34.375% |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  | 27.50% |  |  |
Commission rate, adjustment to percent of ceded written premiums |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission rate, adjusted percent of ceded written premiums |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission rate, adjustment criteria, threshold percent of specialty risk and extended warranty to covered business |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission rate, adjustment criteria 2, floor percent of specialty risk and extended warranty to covered business |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission rate, reduced adjustment to percent of ceded written premiums |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission rate, reduced adjustment to percent of ceded written premiums |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract extension |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract extension |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancellation notice period |  |  |  |  |  |  |  |  |  | 9 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancellation notice period upon the occurrence of certain early termination events |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early termination events, reduction threshold of stockholders' equity |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premiums and losses related to policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum limit of liability attaching |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  | 10,000,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent basis currency equivalent of maximum limit of liability attaching |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit sharing commencement period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of excess performance to be shared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  | 10 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from related parties |  |  |  | 467,000 | 489,000 |  | 1,468,000 | 1,397,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,000 | 1,404,000 | 849,000 | 6,438,000 |  |  | 70,000 | 27,000 | 164,000 | 60,000 | 1,410,000 | 547,000 | 3,285,000 | 1,198,000 |  |  |  |  |  | 170,000 | 535,000 | 369,000 | 582,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  |  | 467,000 |  | 467,000 |  | 467,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of gross liabilities, from related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of gross liabilities, from third party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses recorded from related party transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,429,000 | 46,969,000 | 199,841,000 | 132,098,000 |  |  | 1,398,000 | 1,340,000 | 4,294,000 | 3,774,000 |  |  |  |  | 25,000 | 404,000 | 181,000 | 1,921,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,000 | 463,000 | 94,000 | 472,000 |  |  |  |  |  |  |  |  |  |  | 3,043,000 | 2,216,000 | 9,064,000 | 6,412,000 |  | 1,080,000 | 952,000 | 3,182,000 | 2,667,000 | 0 |  | 38,000 | 6,000 | 57,000 | 38,000 |  |  |  |  |  |  |  |  |  |
Percent participation in reinsurance program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess reinsurance coverage above threshold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance coverage threshold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance coverage limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual aggregate deductible |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining percent participation in single carrier |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of credit insurance business to cede |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of general liability business to cede |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan to related party | 167,975,000 | 167,975,000 |  | 167,975,000 |  | 167,975,000 |  | 167,975,000 | 167,975,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan to related party, Basis spread on LIBOR |  |  |  | 0.90% |  | 0.90% |  | 0.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan to related party, LIBOR basis spread assessment period |  |  |  |  |  | 360 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral held by related party |  |  |  | 1,095,601,000 |  | 1,095,601,000 |  | 1,095,601,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 857,013,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest on collateral held by related party |  |  |  | 7,346,000 |  | 7,346,000 |  | 7,346,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,967,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brokerage fee, percent of premium assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for loss and loss adjustment expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,441,000 | 6,299,000 | 8,441,000 | 6,299,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brokerage fees paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,000 | 20,000 | 22,000 | 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly brokerage fee, below portfolio threshold, percent of average holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.05% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly brokerage fee, portfolio threshold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly brokerage fee, above portfolio threshold, percent of average holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission rate, adjustment criteria, loss ratio floor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 81.50% |  |  |  |  |  |
Commission rate, adjustment criteria, loss ratio ceiling |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |

X
- Definition Loans and Leases Receivable, Related Parties, Variable Interest Rate Assessment Period + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Payments for (Proceeds from) Brokerage Transactions + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Related Party, Ownership Percentage + References No definition available. + Details
Name: | mhld_RelatedPartyOwnershipPercentage
Namespace Prefix: | mhld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Related Party Transaction, Accrued Interest on Collateral Held by Related Party + References No definition available. + Details
Name: | mhld_RelatedPartyTransactionAccruedInterestOnCollateralHeldByRelatedParty
Namespace Prefix: | mhld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Related Party Transaction, Agreement Period + References No definition available. + Details
Name: | mhld_RelatedPartyTransactionAgreementPeriod
Namespace Prefix: | mhld_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related Party Transaction, Annual Aggregate Deductible + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related Party Transaction, Automatic Renewal Period + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Related Party Transaction, Brokerage Fee, Percent of Premium Assumed + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related Party Transaction, Cancellation Notice Period + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related Party Transaction, Cancellation Notice Period Upon the Occurrence of Certain Early Termination Events + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Related Party Transaction, Collateral Held by Related Party + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Related Party Transaction, Commission Rate, Adjusted Percent of Ceded Written Premiums + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Related Party Transaction, Commission Rate, Adjustment Criteria 2, Floor Percent of Specialty Risk and Extended Warranty to Covered Business + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Related Party Transaction, Commission Rate, Adjustment Criteria, Loss Ratio Ceiling + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Related Party Transaction, Commission Rate, Adjustment Criteria, Loss Ratio Floor + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Related Party Transaction, Commission Rate, Adjustment Criteria, Threshold Percent of Specialty Risk and Extended Warranty to Covered Business + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Related Party Transaction, Commission Rate, Adjustment to Percent of Ceded Written Premiums + References No definition available. + Details
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Namespace Prefix: | mhld_
Data Type: | num:percentItemType
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